Blower.



@E51 Mmm@ @am C. V. KEER.

BLOWER.

APPLICATION FILED 11116.14, 1911.

1,0809763,V Patented 1180.9, 1913.

4 SHBETSSHEET l.

@fm1/@M1 1 [N VENTO/1' C. V. KERR.

BLOWER.

APPLIUATION FILED 11130.14, 1911.

1,080,?63 Patented Dec. 9, i913.

4 SHEETS-SHEET 4.

WTNESSES [NI/ENTOR 'unrTn sTaTs raTnnT ernten.

CHARLES V. KEER, OF WELLSVILLE, NEW YRK, ASSIGNOR T0 MOEYIFN BROS., QF

WELLSVILLE, NEW YORK.

BLOWER.

Patented Dec. 9, 1913.

Application led December 14, 1911. Serial No. 665,785.

To all whom t may concern Y Be it known that l, CHARLES V. linnn, acitizen of the United States, and a resident of Wellsville, New York,have invented certain new and useful Improvements in Blowers, of whichthe following is a speciication. My invention relates to a blower of thepropeller type, specially adaptedvfor supplying air under pressure tofurnaces, although it may be use'd for other purposes.

More particularly, my invention comprises two impellers of the disk typearranged to work toward each other and usually mounted on a singleshaft, in combination with a suitable delector and a volute casing.

vFurther, the invention consists in spe-v cially shaping the blades ofthe impellers .to coperate with the other features of the invention tobest advantage.

Further, Iprovide a novel form of bearing for the impeller shaftcomprising a f stufling box which prevents atomizing and waste of oilsupplied to the bearing.

I will now describe my invention in detail with reference to theaccompanying drawing which illustrates exemplifying structuresin whichthe invention is embodied. Figure l is a vertical section of one form ofthe invention. Fig. 2 is an enlarged sectional view of one of thebearings. Fig. 3 is a vertical section of another form of the invention.Fig. 4 is an enlarged detail of vthe shaft, impellers, and deflect-or.Fig. 5 is an enlarged front view of one of the blades. Fig. 6 is a sideview of the same. Fig. 7 is a section of the blade near the tip. Fig. 8is a section of the blade near the base. Fig. 9 is an end elevation ofthe form of blower shown inv Fig. l. Fig. 10 is an end elevation of theblower shown in Fig. 3. Fig. 11 is a sectional detail of 'a modiliedform of delector shown in proper relation to the shaft and impellers;and Fig. l2 is still another. modiiication of the delector.

Referring first to Figs. l and 9, reference 'character l designates theshaft, carrying impeller hubs 2 on which blades 3 are mounted. ,Theseblades may be secured inthe mannen fully described in my prior pend--ing application, Serial #648,584, iiled September 9, 191?, and theblades may also be formed as described in said application and asillustrated in Figs. 5 to 8 inclusive,,in

which it appears that while the blades near the tip have a moderatepitch angle inthe direction of rotation, this angle proportionatelyincreases toward the base as shown in Fig. 8, where the angle is veryabrupt, so that at all portions of their length the blades have animpelling capacity suited to their angular velocity at that point. Theblades as shown in Figs. 7 and 8 have curved impelling faces and in thepreferred form this curvature increases from the tip toward the base ofthe blade. The important shape of these blades may be graphicallydescribed by saying that the blades have curved iIn pelling faces andthat the average pitch-r angle of the blades with relation to the planeof rotation increases from the tip toward the base. The average anglemay, of course, be indicated by a straight line drawn from one edge ofthe blade to the other in planes parallel to the planes indicated inFigs. 7 and 8. More particularly, the shape of the blades may bedescribed by saying that they have curved impelling faces, the curvatureincreasing from the tip toward the base, the average pitch angle alsoincreasing from tip toward the base. This form of blade when thecurvatures uniformly increase from tip to base and angle correspondinglyincreases, may mathematically be described as an increasing helicoidalpitch. This mathematical term, however, is not employed in the claimsbecause the change in curvature and pitch angle may be not absolutelyuniform, and, therefore, not exactly in accordance with the mathematicaldefinition, while the blades may still come within the spirit oftheinvention as described by the graphic phrases above. The shaft l issupported in bearings carried by the boxes 4. 5 designates in generalthe impeller casing, of which the periphery 6, as shown in Fig. 9, is ofvolute form. he casing terminates at 7 in a discharge opening. Thecasing is provided at each side adjacent to one of the impellers with aflared'mouth orI supply passage 8. rlhe tips of the ,blades revolveclose to the throats 9 of these supply passages. Struts 10supportbearingboxes il.

Surrounding the shaft, between the two iinpellers, is a deflectordesignated generally by reference character ll. The form Of thisdelector may vary greatly. As shown in Fig. l an approved form -onsistsof a double conod of which the small v.ends are se.

ice

ies

cured to the hubs and the large ends meet to ferm an annulus 12centrally located within the casing. When the shaft is vre` volved atsuitable speed, the disk impellers with blades peculiarly shaped, asdescribed in my aforesaid application,take air through theV supplyports8 and deliver it at high velocity into the casing. The impelled airleaving the inner edges of the blades takes a diagonal path inward,forward y(in the direction of shaft rotation) and outward, and thevolute casing effectively accommd' dates the air entering in this mannerand efficientlyl converts the kinetic energy 'of the `fluid into staticenergy or pressure. Th@ defiector 11 serves edectively, by reason of itsform and arrangement, to prevent eddy vcurrents which otherwise tend toformwithin the casing.

A blower constructed as 'described will very etliciently developsatisfactory pressure vfor supplying air for combustion lto fur` naces,etc.

In blowers and exhaust 'fans heretofore constructed, it has been foundthat the entering air and the rapid rotation ofthe shaft tend to atomizeoi vin the bearings and to vrapidly dissipate and waste the lubricant.

To prevent this AI provide my'bearing boxes l, as shown 1n F 1g. 2, withstuffing glands'15 v secured vby screws 1G. By means of these stuffingboxes and'packing 17, the shaft beari ings toward the impellers may bcmade satisfactorily oil-tight and wastev of oil-may be prevented. Thedetails of the bearingproper 'may vary greatly but the describedconstruction' operatesI satisfactorily in' connectionv .with lringoiling bearings as illustrated.

It has been stated that the form of the delector may be varied greatly.iig. 11 shows a deflector consisting of a-hollow cylinder 30 placedbetween the impeller hubsI andto this may beadded a central disk 31. Thecylin-l der 30 vforms in e'ect an enlargement of the shaft and ltakes upeddy space that would otherwise be present, and the disk -31 also formsa baille which prevents eddy currents. Instead of the conoidal deflectorshown in Fig. 1, a delector of double straight conical form, as shownin' Fig. 12, 'may be employed. "Further, the size of the centralportions of the dellectors, in any of th'ese forms, and the consequentangle of the cones, or

`other dimensions, may be considerably varicd.

Fig. 3 shows a modification of the blower construction in which anannular throat or nozzle 410 is placed between the casing 5 and thedischarge chamber 4:1 adjacent to the deiector. This forni of the bloweriseflicient and desirable in some cases.

I claim:

1. In a blower, the combination of a volute casing, a shaft therein, adisk impeller on the shaft, a detlec'tor at the discharge side of theimpeller, a bearingfor the shaft at the suction side of the impeller,and a stufling box loss due to fan suction. f

2. In a blower, the combination of a volute on the'shaft arranged todischarge toward each other, and a deiiectorbetween the impellers,bearings for the shaft outside the im-l pellers 'and stalling boxes forthe bearings about the shaft to prevent oil loss due to fan suction. y

3. In a blower, the combination of a volute casing, a shaft, two diskimpellers on the peller con'iprising a hub and blades, said pitch-angleof the blades with relation to the plane of rotation increasing from thetip toward the base, and a deflector within the casing about the shaftbetween the iinpcller hubs.

casing, a shaft, two disk form impellers on the shaft, one near eachside of the casing, the casing boing provided with opposite inletopenings leading to said impellers, and a double conoidal deflectorwithin the casing and about the shaft between the impellers, the conoidbases adjoining each other centrally within the casing.

5. '.lhe combination of a volute casing, a shaft therethrough, adeilector thereon centei-ed in the casing, the Casin g being providedwith annular air inletsione at each side, disk the inlets and workingtoward the center, the blades of said impellers having curved workingfaces, vthe curvature of the faces increasing from the tip toward thebase and the average pitcheanglc of the blades also increasing from thetip toward the base of the blades. l

(5. In a blower, the combination of a volute casing, a shaft,'diskimpellers Comprising a hub and blades, said blades having curved workingfaces, the curvature of said faces increasing froni the tip toward thebase of the blades, the average pitch angle of the blades to the planeof rotation also increasing from thetip toward the base of the blades.

7. In a blower, the combination of a rotatable shaft, a discharge casingof volute form in a plane perpendicular to the shaft, the sides of thecasing being provided with circular air inlets concentric with theshaft, two disk impellers on the shaft, one within each of said airinlets, the impellers being arranged todischarge toward each other, anda deflector within the casing between the impellers.

8. In a table shaft, a discharge casing of volute form sides'of thecasing being provided with cirfor the bearing about the shaft vtoprevent oil casing, a shaft therein, two disk impellers qshaft, one ateach side of the casing, each im' bladesI having curved faces, the'averagey l. In a blower, the combinationof ay volutey blower, thecombination of a rotain a plane perpendicular to the shaft, thetimpellers on said shaft one withi-n each of iso vculurair inletsrconcentric withv the shaft, .charge edges to obtain an increased distWodisk impellers on the shaft, one Witliin charge head, and a' deectorWithin the cas- 10 ,each of said air inlets, the impellers being ingbetween .the impellers.

arranged to discharge toward each other,\ CHARLES V. KEER -each impellercomprising a hub Asind blades,

said blades having concaved working faces Witnesses:

of helical pitch,'sa1d pitch increasing at all ALWIN SGHALLER, points ofthe blade from the inleg; to the clis-A CHAS. O. LIVERMORE.

